Cisco Switching/Routing :: 3750 - L2 Trunking Versus L3 Switching

Dec 9, 2011

some of our switches have the switchport mode trunk command configured between the 3750 switches but other 3750 switches connected to our 6509 core switch do not have the switchport mode trunk command to permit Vlans from going across the swtiches instead it has an ip address and says no switchport what is the difference between does two. Is trunking used only for Layer 2 and L3 is used to route  interface vlans?

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Cisco Switching/Routing :: 3750 Stack And Trunking

Mar 5, 2012

I currently have 5 3750s connected via Stackwise. This stack is connected back to my core (6509s) via fiber (1Gig to Core1 & 1Gig to Core2). I want to move the 5th 3750 to another closet due to an addition of a new patch panel. Due to max length of 10 ft. for stackwise, my plan is to connect this 5th switch back to the stack using trunked fiber ports, with them being an etherchannel (2Gig). Also plan to use single fiber port form 2 different switches in the stack to provide some redundancy for the 5th switch. Should I be alert of any issues with this connection design? Do I need to properly remove the 5th switch from the stack using, no sw 5 provison sw-model or can I just disconnect stackwise and connect back with fiber?

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Cisco Switching/Routing :: 3750 / NTP Server Versus NTP Peer?

Jul 10, 2012

On a csico 3750 switch I have ntp server < IP of  stratum 1 Time Server> I want the swit to sync to the to time server and provide time to peers on my network. Do I have to be configured for  ntp peer  < IP of stratum 1 Time Server> for that to work? 

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Cisco Switching/Routing :: IP Routing On 6500 Series Versus 3750?

Jan 24, 2013

For intervlan routing, Is 'IP routing' command enabled by default on a 6500 series switches based on the IOS?and on 3750 switches, do we need to enable the "ip routing" command manually for intervlan routing?

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Cisco Switching/Routing :: VTP Trunking On 2801

Feb 20, 2012

I am very new at this, but we have a 2801 router running 12.4, a 3560 that acts as the "Core" switch, and a bunch of remote 2960G's that connect via fiber to different buildings.

I am tasked to VLAN this network to reduce broadcast traffic. I started by setting up a VLAN 169 on the "3560" named the VTP domain, changed to version 2, and no password. THe Core switch and remote switch can share the VTP info, I HAD the Router seeing it too (able to ping until I changed the "Domain" and "VTP Version"

The switches see each other fine, my problem is the Router sub interface 0/0.169 I cannot get to see the VTP domain. I imagine because I don't have a "Trunk port" set on the Router, but the option is not there. Meaning I cannot do a "switchport mode trunk" on it. The only thing I see is to make it:
TCRouter(config-subif)#encapsulation dot1Q 169 native

But, my "int fas 0/0" is used now as the main interface for our "only" network, do I need to turn this over to a subinterface and make it "Native" then the difference of the subinterfaces will advertise? Here is some of my conf:

Core SW:
TCCoreSW#sh vtp status
VTP Version : running VTP2
Configuration Revision: 8
Maximum VLANs supported locally : 1005

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Cisco Switching/Routing :: Trunking Avaya POE To 3750X

Apr 10, 2013

Attempting to trunk an Avaya POE switch to a Cisco 3750X switch. Here's the Cisco port config: [code]
 Cannot PING Avaya switch at I have Cisco switches at .1,.2 and .3. I can PING those and access them. Any additional config needed on Cisco trunk port?

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Cisco Switching/Routing :: Trunking With 4948 And 6506

Apr 23, 2012

We purchased two new 4948 with two 10GE uplink ports and upgraded the devices to run IOS 15.  My 6506 is running Sup 720 with s77233-adventerprisek0_wan-mz.122-33.SXI9.  Currently we have 4948's connected to the same 6506's with no problems.  Today I tried to add the new switches with new IOS and it caused of  of my 6506 core switches to failover.  I can't explain why because it was close to start of business and couldn't do much troubleshooting.

Currently we have four 4948 (running IOS 12.2(14)  switches running Layer2 connecting dually to each of the two 6506 cores via 10GE fiber uplinks.   I tried to add two more to the scenario, again running layer2 and dual-honing them to each of te 6506 switches.  there are two 6506 core switches and they run HSRP and spanning tree is manually set to give priority to even vlans on one 6506 and odds on the other 6506.  Also the new switches I tried to add did had rootguard applied as well as the uplinks.
We have to get this working and have no test environment to work with.  We need to do this late this evening after close of business.
On another note, I have had problems upgrading some of my older 4948's to IOS 15.  I followed Cisco's suggestion and upgraded the EPROM first and then the IOS upgrade took on three of the switches that were ordered rather recently.  The four that were ordered in one batch will not take the upgrade even following Cisco's instruction and lots of other tricks.  Nothing works. Having problems with IOS 15, in general?

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Cisco Switching/Routing :: Configuring 4507R For LACP And Trunking?

Apr 3, 2008

We're trying to configure our Cisco 4507 (Supervisor Engine IV) to allow a new Dell server with a pair of Broadcom 5708 GigE NIC's to aggregate its NIC's to give us a 2gbps link to the switch.
So far we seem to have got the team and LACP up and enabled, but the adaptor that the Broadcom Admin Util creates for the team is only showing a 1gbps connection where I would have expected it to show as 2gbps.
The individual NICs show as connected at 1gbps. We're not Cisco experts so are struggling on how to get the 2 NICs to aggregate.
On the server side we've done nothing other than create a team using 802.3ad LINk Aggregation using LACP.
This is what I think the relevent output from "sho conf" is, more available if needed.
version 12.2
boot system flash bootflash:cat4000-i9s-mz.122-18.EW1.bin
interface Port-channel2


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Cisco Switching/Routing :: Trunking Between 3500XL And 3Com 4800g

Oct 14, 2012

I am trying to trunk between a 3Com 4800g and a Cisco 3500xl.  I can get the a PC that connects to a vlan 1 port on thecisco switch to connect to the 3com switch and get connectivity.  However, I cannot get anthing on the cisco switch that is on vlan 2 to connect and get dhcp.  I am not a 3com guy, so I am not familiar with the command and configs.We have 2 vlans on both switches:  Vlan 1 is Admin and Vlan 2 is Student.

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Cisco Switching/Routing :: 2960 / Trunking Not Replicating Vlans?

Feb 8, 2012

I have two switches, a 2960 (sw01) and a 2948 (sw02). The sw01 is trunking via dot1q on Gi0/24 to sw02 on 2/48. Why are VLANs 2-4 not active on sw02?
sw01#sh int Gi0/24 trunk
Port        Mode         Encapsulation  Status        Native vlan
Gi0/24      auto         802.1q         trunking      1
 Port        Vlans allowed on trunk
Gi0/24      1-4094


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Cisco Switching/Routing :: C2900 / Trunking Between Router And 2 Distribution?

Oct 20, 2012

Imagine I am designing  a small network with a C2900 router running OSPF and in the future BGP with service provider. Please see attached diagram.The router is connected to (2) C3750 Layer 3 distribution switches. Then one C3560 layer 2 switch to serve future IP phone users and desktops.

a)If I connect the router interface to the (2) 3750 switches, if I make the router interface fa0/0 and fa0/1 as a trunk to accomodate VLAN 200 and other future VLANs, don't I have a problem with overlapping networks between router interface fa0/0 and fa0/1? 
b)Alternatively, I could make the Router1 fa0/0 and fa0/1 configured with IP addresses and advertised in OSPF. Then the SW1 fa0/24 and and SW2 fa0/24 I could make as 'no switchport and create a routed interface port' with IP addresses, also running OSPF. Question is, from a scalable design perspectie, would you create 2 management networks and use those when assigning the IP addresses for Router1 fa0/1 and fa0/2? Because again Router1 fa0/1 and fa0/2 obviously need to be placed on different networks to avoid overlapping. So my question is more about proper network planning design to make this scalable to accomodate future VLANs in the future.Using trunks between the Router1 and SW1 option:
int fa0/0
   description connection to SW1
   no ip add
   int fa0/0.200


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Cisco Switching/Routing :: 3560 CG Port Goes Down When Configuring Trunking

Jan 31, 2012

I have a 3560 8 port switch.  Int gi0/9 is trunked to another switch downstream.  When I try to configure int gi0/10 to trunk to a switch upstream the interface on the switch goes down and I have to either reboot the switch or plug directly into the switch and telnet into it to turn off trunking on the interface.  When I configure trunking on the interface on the upstream switch that connects to this interface the same happens on that switch.  The upstream switch is a 3750 with 12 sfp ports.  Several interfaces are trunking to other switches from this switch.  Spanning tree is not configured on the 3750 at all , and is not configured on either gi0/10 or gi0/9 on the 3560.  I was consoled into the 3560 during a reboot after the interface went down, a message came up that said something like "Spanning Tree returning gigabit ethernet 10 to constant state"  Why would I get this message if spanning tree is not enabled on the gig ports on either end of the trunk? There is no loop to require spanning tree to shut down an interface.  I have several other 3560's configured as I would like to configure this switch and they are trunking without issue. 

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Cisco Switching/Routing :: Trunking Between Catalyst 2950 Switches?

May 14, 2012

have setup a small lab as per CBTNuggets. Everything was going well until I introduced a second switch to create a trunk. Now I cannot ping between my two switches. Both show operational mode as down:
SWITCH1#show interfaces f0/12 switchport
Name: Fa0/12
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q

I have tried to allow all vlans or vlan 1 specifically and the output of the above doesn't seem to change. I am wondering if there is something in the config-register that is preventing trunking, but I don't really know enough yet!

The output of my second switch is identical to this one, the only difference is that I have it configured as a vtp client.

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Cisco Switching/Routing :: Trunking Between 3560 And IBM Blade 3012

Nov 18, 2012

Im having problems changing a connection between a Cisco3560 and Cisco IBM Blade switch 3012 actually the configuration is access in Cisco 3560 and trunk int Cisco 3012 when i change the connection to trunk i lose conecctivity to the servers connected in the 3012, i have changed the access from vlan 1 to the respective vlan in the access port of the servers

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Cisco Switching/Routing :: Trunking With HWIC-4ESW On 1921?

Feb 27, 2012

We have been facing a problem at my company ! We have a Cisco Router 1921 with one HWIC-4ESW in trunking with a RuggedCom switch RSG2100.When I use the GigabitEthernet port to make a trunk, I create 2 sub-interfaces (one for each Vlan) and configure the Port on Switch as Trunk, the inter-VLan routing works with no problem.But now I need to use this configuration using the HWIC-4ESW on Router, and I can't do this work. I try creat interface Vlan for each vlan, and try creating the VLans at Router Vlans database, but no way. At router I enter in interface and try to do the switchport trunk command to add a Vlan, but doesn't work.

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Cisco Switching/Routing :: 2960 / QoS Tagging And Dot1q Trunking?

Nov 9, 2011

If you have a router with multiple direct vanilla FE (non trunked) interfaces on a switch trying to send QOS tagged packets to a wifi bridge several switches away does the trunking in the switched infrastructure mess with the qos tags if no qos is configured on the switches.
Does it depend on the switch?  We have new 2960's running 12.2 and a few older 2950's running 12.1

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Cisco Switching/Routing :: C2924 Not Responding After Issuing Trunking Command

Apr 24, 2013

I've run into an issue with this type switch. I've a 2611xm router connected to a C2924-XL switch ((C2900XL-C3H2S-M), Version 12.0(5)WC17) Basically i configured the router as a RoTS with two sub interfaces setup with encapsulation dot1q.

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Cisco Switching/Routing :: How To Connect Two Switches 4505 Using Trunking Method

Dec 26, 2011

How Can i Connect two switches 4505 using the trunking method,…

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Cisco Switching/Routing :: Trunking Nexus 3048 With Force10 S4810

Apr 11, 2012

I have been assigned the task of trunking VLAN between a Nexus 3048 and a Force10 S4810. This would seem easy enough but I am really having a bear of a time getting it to work. I have devices configured on VLAN 602 on both sides but they just are not talking.
NX0S 3048
interface configuration
interface Ethernet1/49
switchport mode trunk


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Cisco Switching/Routing :: 3560 PoE Blocking Ports In Trunking Between Switches

Apr 25, 2012

I have a connection between switches, There are a 3560 (Gi0/37) and a 2960 (Gi0/1), the  problem is in the port Gi0/37 of the 3560 switch and this is the log. [code]
I dont understand what is the problem, actually i have added the command power inline never on the port and the problem is solved, but we haven´t changed configuration.

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Cisco Switching/Routing :: 3560 - Vlan Trunking Between Switches Not Working

Jun 3, 2012

We have two Cisco switches with one 3560 and one 3750 we have created a new Vlan 4 with IP 10.1.3.x - no shut then assigne to gi 2/0/46 on the 3560 Vlan 4 ip address 10.1.3.x no shut then assign to FA0/45. All interfaces are up up along with the Vlan up up, we can ping the local IP address bu not able to pint the other switch.

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Cisco Switching/Routing :: Ping Error Between Two 6504 Trunking Switch?

Oct 17, 2012

We have network topo ( attach file)Two switch run VRRP, if I ping from switch SW-6504-01 with source, ping lost one packet  every 10 packets.We have other interface vlan with same problem
this is some config:

interface Port-channel1
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
interface GigabitEthernet3/47


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Cisco Switching/Routing :: Nexus 1000v Private-Vlan Trunking

Apr 14, 2011

Having problem pinging from Host A on ESX1 to Host B on ESX2.  Each host are assigned the same port-profile.  If I put 2 host's on the same ESX machine using the same port-profile, they are able to ping each other.
n1kv-vsm# sh port-profile name xxx-prod-40port-profile xxx-prod-40  description:  type: vethernet  status: enabled  capability l3control: no  pinning control-vlan: -  pinning packet-vlan: -  system vlans: 1  port-group: xxxl-prod-40  max ports: 32  inherit:  config attributes:    switchport mode private-vlan host    switchport private-vlan host-association 40 400    no shutdown  evaluated config attributes:    switchport mode private-vlan host    switchport private-vlan host-association 40 400    no shutdown  assigned interfaces:    Vethernet3    Vethernet4
System-uplink profile is trunking all vlans.

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Cisco Switching/Routing :: HP ProCurve 5406 VLAN Trunking To 3560

Jan 12, 2010

I have a HP Procurve 5406 connected to a Cisco 3560 on a temporary cat5e connection and I have Mitel IP phones needing to go on the Cisco switch.Ive configured the HP Procurve port to TAGGING both VLAN 10 (data) and VLAN 20 (Voice). NO is selected for default VLAN 1.The Cisco is configured on the port with switchport encap dot1q and switchport mode trunk.
Ive configured an IP for interface VLAN 10 and i cannot ping it from across the network. The interfaces are up and happy. I have tried changing the VTP status from transparent to server (VTP pruning is off) ive tried setting allowed vlans 10,20. Still not a think. The worse thing is that i have a working Cisco switch with the HP procurve that i checked the config on and its the same! The only difference is that the media type is SX over SFP in that case.
p.s not that im at this stage yet but i initially configure the FastE ports as trunks with native vlans because i was using non-cisco phones. On a spare port i convigured the voice vlan 20 and i say on the mitel phone that it was looking on vlan20! I didnt expect that, i thought the Voice VLAN ID was carried on CDP enabled devices only.

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Cisco Switching/Routing :: 3750X / 6509 - Trunking Over Single Mode Fiber

Oct 26, 2011

I'm having a problem with some new gear and can't seem to figure it out.  I have a 3750X-48P-S with a C3KX-10G-NM using SFP-10G-LR transceivers and I'm trying to trunk that with a 6509 that has a X2-10G-LR transceiver over single mode fiber.  This is not working.  Cisco TAC says the SFP+'s that we just got brand new are both bad and we need to order new ones.  I find that hard to believe but who knows.
The switch recognized the module and I tested all 4 ports in gigabit mode using GLC-SX-MM transceivers, all worked great.  I have the SFP+'s in tengig1/1/1 and 1/1/2 as they should be.  There are no other SFP's in the module either.
When I do a sho int tengig1/1/1 and 1/1/2 the media type doesn't show the transceiver that is installed like it does for the GLC-SX-MM ones.  Maybe it's not supposed to or maybe it just doesn't recognize them and it's a hardware issue.

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Cisco Switching/Routing :: Virtual Clustering / Split Multi-link Trunking On 4503

Mar 30, 2012

Do the cisco 4503 switches support virtual clustering feature ? I have a requirement where switch ports on two different 4503 switches need to combined in the same Link aggregation group . This is needed because the firewall notes say that the aggregated interfaces need to be conected to a single switch and combined in the same LAG .  So according to the diagram below , the interfaces marked RED need to be in the same LAG in the switches , same for the interfaces marked BLUE . I have done the same setup using Juniper switches where it uses VIRTUAL CLUSTERING to group the different switch ports in the same LAG.

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Cisco Switching/Routing :: 892W / LAN Versus WAN Ethernet

Feb 14, 2012

I own a Cisco 892W router. The router has 2 WAN ports and 8 switch ports. Now I know -
-WAN ports can create sub interfaces, assigne IPs, cannot be assigned to a VLAN - sounds very much like a routing port. (sh interface gives - Hardware is PQII_PRO_UEC)
-Switch ports are for VLAN assignment, trunking, IP assigment etc,. (sh interface gives Hardware is Fast Ethernet)
I know they are different but at the same time confuced what the difference are? I also know on some 3xxx series switchs you could say "no switchport" and translate a switch port to a layer 3 port. But on 892W you can't do this? Struggeling to understand the difference.

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Cisco Switching/Routing :: 802.1w / 802.1s - Diameter Versus Max Hops

Jan 25, 2013

What is the difference between the Diameter and the Max Hops Remaining in RSTP/MSTP? Like Cisco, the maximun value for diameter is 7, but, can i have a ring topology with 10 switches in the Network?

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Cisco Switching/Routing :: Ip Sla Differences Between 2960S Versus 3560?

May 16, 2013

We replaced a 3560 with a new 2960S and I'm only able to configure a single ip sla where before we had three ip sla entries on the 3560. Obviously, one is a L2 switch and the other a L3 switch. This is an expected difference between switches, correct?

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Cisco Switching/Routing :: 3850 Versus 3750x For New Deployment

May 6, 2013

What is the preferred access switch for new deployment. Choosing between 3850 and 3750x. I have to say that the 3850 wireless features will not be used in this deployment and 4 switch for stack is enough... Looked and read everything that I found in the press, I can not make an informed choice. I bow to 3850, but I was apprehensive following circumstances:1) not too positive reviews2) to long list of open caveats3) to long list of features are not supported in Cisco IOS XE Release 3.2.0SE4) IOS XE : (With regard to the first three points - yes, I understand that the product is new and it has not gone further stage of "childhood diseases" ...Regarding the fourth point - I understand correctly that this is the direction to be moving Cisco Systems  and soon all products migrate from classical IOS to IOS XE and so on?

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Cisco Switching/Routing :: Safe Harbor Versus Sup720

Mar 11, 2012

Cisco Safe harbor, I came nto know this can be a replacement for Sup 720.

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Cisco Switching/Routing :: Throughput 3560 Versus 2951

Oct 29, 2012

I see the throughput of a ISR is 296.96 Mbps how would this compare to a 3560 if the figure is 38.7Mpps?
What would the throughput of a 3560 be in Mbps?

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Cisco Switching/Routing :: Ghost Multicast Versus 3750G

Feb 13, 2013

I manage a network with a ghost server, a 3750G, several outside access, and some vlans.This is a very simplify view of this network:
The ghost server is on all vlans connected to a trunk port on the 3750G which is used as a central switch and for basic routing.All equipements connected to vlans 1, 2 or 3 are on 2950 switchs themselves connected to the 3750G on dedicated access ports, each in there respective vlans.

All equipements connected to vlans 1, 2 or 3 have as gateway a vlan interface on the 3750. (10.0.x.3)All the vlan interfaces have route-maps applied on them to redirect traffic to their dedicated outside access.The route-maps match only traffic destinated to the outside.
Everthing is working well but the multicast.When I create a ghost session on the server, I can see computer connecting on it, but the multicast never start.If I use directed broadcast it works with good perfs, but the CPU processes of the 3750 go high because of the IP Input (Till 99%).If I remove the route map from the vlan interface which is on the ghosted network, the multicast works but with poor perfs.If I shutdown the vlan interface the multicast works well with good perfs.
It seems my problems are tied with the Vlan interfaces but I don't know why.
This is a sample of the config:
switch 1 provision ws-c3750g-24ts-1u
system mtu routing 1500
vtp domain SM
vtp mode transparent
ip routing


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